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folly

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noun American English pronunciation: folly /ˈfɑli/ 
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singularfolly
pluralfollies
  1. 1
    [countable/uncountable] formal a way of thinking or behaving that is stupid and careless, and likely to have bad results

    The judge described the incident as an act of folly.

    it is folly to do something:

    It is absolute folly to go mountain climbing without the proper equipment.

    the folly of (doing) something:

    She soon realized the folly of her actions.

    I pointed out the folly of overspending on that scale.

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